[JackCh]

> "What tumblr did was that suddenly all "NFSW" things to US standards"

What was honestly expected? Tumblr was an American company and they got bought by another American company. The brand had a reputation for hardcore pornography which was doubtlessly toxic to advertisers (most of whom are also American companies), so expecting Yahoo to turn a blind eye just wasn't realistic.

If you want a website moderated to the Japanese standard, you should probably find a website run by a Japanese company that supports itself with advertisements purchased by Japanese companies (a Japanese company in the business of selling advertisements to American companies would probably apply the American standard.)